Description

For some reason, customer need to use virtual ip as the source address for outband  instead of base ip on VCS envroiment.

Under Linux platform, you can use the comand "ip route" to change route table so that  outbound packets use the  virtual ip as  the the source address.

Follow is example:

#ifconfig -a

.................

eth1      Link encap:Ethernet  HWaddr 1C:C1:DE:77:EA:3C  

          inet addr:10.4.1.13  Bcast:10.4.1.255  Mask:255.255.255.0                 <==========base ip

          inet6 addr: fe80::1ec1:deff:fe77:ea3c/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:32190 errors:0 dropped:0 overruns:0 frame:0

          TX packets:32167 errors:4 dropped:0 overruns:0 carrier:4

          collisions:0 txqueuelen:1000 

          RX bytes:3063872 (2.9 Mb)  TX bytes:2237822 (2.1 Mb)

          Interrupt:40 Memory:fa000000-fa7fffff 

eth1:0    Link encap:Ethernet  HWaddr 1C:C1:DE:77:EA:3C                                   

          inet addr:10.4.1.18  Bcast:10.4.1.255  Mask:255.255.255.0                        <========virtual ip

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          Interrupt:40 Memory:fa000000-fa7fffff 

# ip route

...............

10.4.1.0/24 dev eth1  proto kernel  scope link  src 10.4.1.13 

............

At the time, all outbound packets of network segment 10.4.1.0/24 will use the base ip as the source address.

we can use command "ip route" to change:

ip route change 10.4.1.0/24  dev eth1 src 10.4.1.18

#ip route

.....

10.4.1.0/24 dev eth1  scope link  src 10.4.1.18

.......

From tcpdump tools, I can find the source address of outbound packets is 10.4.1.18    .

later, you can add it to postonline trigger:

$group = $ARGV[1];
if ($group eq " test") {
system(" ip route change 10.4.1.0/24  dev eth1 src 10.4.1.18 ");
}